解读python小练习

1.新建一个函数，判断是不是int 类型，并测试，不是抛出错误
def adder(x, y):
"""
Return x + y if they are both integers
"""
if not (isinstance(x, int) and isinstance(y, int)):
raise TypeError("Inputs must be integers")
return x + y
res = adder(4,5)
print(res)
2.
import unittest
from adder import adder

class Test(unittest.TestCase):

def test_adder_errors(self):
"Tests ensuring errors in data that cause TypeError raises."
self.assertRaises(TypeError, adder, "123", "456")
self.assertRaises(TypeError, adder, "123", 456)
self.assertRaises(TypeError, adder, "123", 456)
self.assertRaises(TypeError, adder, 1.23, 456)

def test_adder_successes(self):
"Tests ensuring that valid data passes."
self.assertTrue(adder(1, 2) == 3, "1 + 2 is not 3")

if __name__ == "__main__":
#import sys;sys.argv = ['', 'Test.test_adder_errors', 'Test.test_adder_succusses']
unittest.main()
tip:
#理解if __name__ == "__main__"
def main():
print("we are in %s" % __name__ )
print(1)
if __name__ == "__main__": #这个功能还有一个用处：调试代码的时候，在”if __name__ == '__main__'“中加入一些我们的调试代码，我们可以让外部模块调用的时候不执行我们的调试代码，但是如果我们想排查问题的时候，直接执行该模块文件，调试代码能够正常运行！
main()
print(2)
3.
import sys
for n,arg in enumerate(sys.argv): #对于一个可迭代的（iterable）/可遍历的对象（如列表、字符串）,enumerate将其组成一个索引序列，利用它可以同时获得索引和值
print(n,":", arg)
# list = ["这","是","一个","测试"]
# for i in range(len(list)):
# print(i,list[i])
# list1 = ["这","是","一个","测试"]
# for index,item in enumerate(list1):
# print(index,item)

4.
def zip_errors(z):
"""
Validate z as either NNNN or NNNN-NNNN.
"""
l = len(z)
if l not in(5,10):
return "Zip codes should be 5 or 10 characters long"
if (not z[:5].isdigit() or
l == 10 and not z[6:].isdigit()):
return "Zip code contains non-numeric characters"
if l == 10 and z[5] != "-":
return "Ten-digit zips must have a dash between the two parts"
return
tip：
import unittest
def cal(a,b):
return a + b
class CalTest(unittest.TestCase):
def testA(self):
expected = 6
result = cal(2,4)
self.assertEqual(expected,result);
def testB(self):
expected = 0
result = cal(2,1)
self.assertEqual(expected,result)
if __name__ == '__main__':
unittest.main() #执行 unittest.main() ，该函数会负责运行测试，它会实例化所有TestCase的子类，并运行其中所有以test打头的方法。
#多个测试类
#coding=utf-8
import unittest
from test1 import CalTest1
from test2 import CalTest2
if __name__=='__main__':unittest.main()